What was the Chinook's top speed when it entered service?

When the Chinook entered service in 1962, its top speed of 170 knots (310 km/h, 200 mph) put it clearly ahead of the utility and attack helicopters of that era. The aircraft's technical data sheet also lists a cruise speed of 157 kn (291 km/h). More than sixty years later, the Chinook still ranks among the fastest helicopters in the US inventory, a notable achievement for a machine designed above all to move heavy loads rather than to set speed records. That speed advantage over early-1960s rotorcraft is part of why the type has remained in frontline service for so long.

The Chinook flies with two large tandem rotors, one at the front and one at the rear, driven by two turbine engines. If one of the two engines fails, the other can still drive both rotors. Added to this are several fuselage doors, a wide rear ramp, and three ventral hooks for sling loads. The CH-47D, in service since 1979, used that three-hook system to carry up to 26,000 lb (12,000 kg) of external cargo, such as 12 m containers. The CH-47F crew consists of three people: pilot, co-pilot, and flight engineer or crew chief. That engine redundancy and those cargo options are central to the helicopter's reputation as a heavy-lift workhorse.

Successive versions have kept that agility despite growing in weight and capacity. The CH-47F can fly at more than 282 km/h (175 mph) carrying over 9,500 kg (21,000 lb) of payload, thanks to a stiffer machined structure, the CAAS digital cockpit, and a digital flight control system that eases pilot workload. That blend of speed and lift capacity is unusual among helicopters of comparable size. The combination of speed, capacity, and reliability explains why this design, born in the 1960s, remains the US Army's benchmark heavy-lift transport.